As stated in <R07> you will need bumpers to cover the entire bumper perimeter. Please look at how bumper perimeter is defined in section 1.6.
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BUMPER PERIMETER – the polygon defined by the outer-most set of exterior vertices of the BUMPERS when they are attached to the HOSTBOT. (To identify the BUMPER PERIMETER, wrap a string around the BUMPERS at the level of the BUMPER ZONE - the string describes the polygon.)
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This being said, you can have a cut out if you would like, but the bumpers will still be in the way.